An Accessory Pathway Can Shorten The Pr Interval

Occasionally, a muscle bridge exists between the atria and ventricles as a congenital defect. This is termed an accessory pathway which can activate the ventricles before the signal can traverse the AV node. In this case

12. The Electrocardiogram the PR interval will be abnormally short (less than 0.12 sec). This condition, termed Wolff-Parkinson-White syndrome, puts the patient at risk because he or she now lacks the long refractory period of the AV node. Should an atrial arrhythmia such as atrial fibrillation or flutter occur, the ventricle would try to follow it, resulting in too fast a ventricular rate for efficient pumping, often with disastrous consequences. Another problem with these patients is that the accessory pathway may be a source for reentry. Impulses can pass down the AV node and then back up the accessory pathway to restimulate the atria. Because the reentry path is short, the heart will beat very fast, causing a condition termed atrial tachycardia. Atrial tachycardia is common in these patients. The condition is treated by surgically ablating the accessory pathway.

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